Attributes in Ras Msg

start_accounting(boolean): can be set on login and update, to tell the charge module to 
			   start accounting of user.

multi_login(boolean): can be set on login and tell that this ras prevent user from havin multiple 
		      logins

unique_id(string): should be set on all calls, and show the unique id of user

			      

update_attrs(list of str): MUST be set on update calls, and tell the plugins, these attributes has been updated
			   can be an empty list

connect_time(string): can be set on logout call of voip sessions
disconnect_time(string): can be set on logout call of voip sessions

persistent_lan(boolean): set on login calls of persistent lan users

no_commit(boolean): can be set on logout calls, and tells that this call should not be commited or charged

no_connection_log(boolean): can be set on login/logout calls, and tell that this call should not be logged in
			    connection_log
			    
			    
single_session_h323(boolean): tells the voip module, that this is a single session h323
			      voip module then calls ras_obj.setSingleH323CreditTime
			      and ras_obj.setSingleH323CreditAmount (to set the H323-credit-time and H323-credit-amount
			      in reply packet). This should be set on update and login of session.

try_single_session_h323(boolean): if user can't have multiple logins, the session is change to single_session_h323
			          otherwise it's a multi login one.
				  attribute single_session_h323 will be set in ras_msg to show this is a single_session_h323
				  


h323_authentication
h323_pre_authentication or pre_authentication(boolean):tells the voip_module that this is a pre authentication request
h323_authorization

error_key(string): set in ras_msg to inform ras about the error occured in users area
		   set in auth packets

calc_remaining_time(boolean): tells the user module to calculate remaining time for user if possible
			      remaining time will be set in instance info 

ip_assignment(boolean): tells the ippool and assign ip plugins if they need to set ip in this session
			if not set or set to true, ip will be assigned
			if set to false, this session will be ignored by ippool plugin

re_onlined(boolean): This user was re-onlined instead of normal authentication procedure.
		     Reonlined users are recognized by ras and asked to get online again.